| `:spec` | clojure.spec definition for a route data, see `reitit.spec` on how to use this
| `:syntax` | Path-parameter syntax as keyword or set of keywords (default #{:bracket :colon})
| `:expand` | Function of `arg opts => data` to expand route arg to route data (default `reitit.core/expand`)
| `:coerce` | Function of `route opts => route` to coerce resolved route, can throw or return `nil`
| `:meta-merge` | Function which follows the signature of `meta-merge.core/meta-merge`, useful for when you want to have more control over the meta merging
| `:compile` | Function of `route opts => result` to compile a route handler
| `:validate` | Function of `routes opts => ()` to validate route (data) via side-effects
| `:conflicts` | Function of `{route #{route}} => ()` to handle conflicting routes
| `:exception` | Function of `Exception => Exception ` to handle creation time exceptions (default `reitit.exception/exception`)
| `:router` | Function of `routes opts => router` to override the actual router implementation
